Packing and process for manufacturing the same.



UNITED STATES PATENT OFFICE.

CHARLES E. VANCE AND JOHN A. VETTER, OF PITTSBURGH, PENNSYLVANIA.

PACKING AND PROCESS FOR MANUFACTURING THE SAME.

Patented Feb. 25, 1919.

No Drawing. Application filed October 26, 1917, Serial No; 198,615.Renewed January 9, 1919. Serial To all whom it may concern:

Be it known that we, CHARLES E. VANCE and J OHN A. VEI'IER, citizens ofthe United States, and residing in the city of Pittsburgh, in the countyof Allegheny and State of Pennsylvania, have invented or discovered newand useful. Improvements in Packings and Processes for Manufacturing theSame, of which the following is a speci- The basic material which we useis fibrous material, such, for instance, as flax, jute, cotton, rainiefibers, etc. 1

The fiber which we'use may be in loose material form or braided insquare, round or oval form, as is usual with commercial flax packings,or in any other form.

This material we prefer to first bake, at a temperature which preferablydoes not-exceed 221 degrees Fahn, until the moisture is expelled. Weremovemoisture to the ex-.

tent of about 5 to 8% of' the weight of the material which is suflicientfor practical purposes.

The material is then treated, either by dipping or brushing, with any ofthe commercial cellulose lacquers, such as cellulose acetate orcellulose nitrate lacquers to water-- proof the fiber. We havesuccessfully used for this purpose the cellulose lacquer now Told onthe'market under the name pyroxy- We may use with the. cellulose acetatelacquer about 5% of its weight in dissolved rubber, which rubbersolution should erably contain about 2% of sulffir for the purpose ofvulcanization.

In waterproofing the fiber after baking, we treat the fiber by dippingin cellulose acetate lacquer with or without the rubber. We then may, bybrushing -ordip'ping, ap-

. ply outer wearing surface of cellulose pref-x nitrate lacquer. Weimprove the packing by repeated applications of either or bothprocesses.

We dip in cellulose acetate lacquer to get penetration throughout thefiber. We prefer to then apply a coating of cellulose nitrate lacquer onthe wearing surface only.

We may only use the cellulose acetate lacquer or we may apply thecellulose nitrate lacquer only or we may simply paint the wearing sidewith cellulose acetate lacquer.

We prefer to first bake the fiber to expel the moisture bu may omit thebaking operation, and simp y waterproof the fiber as above described.

The cellulose solutions are thin enough to enter into and coat the fiberbut do not cake in or fill the interstices between the fibers or betweenbraided strands of fiber.

After the fibers have been treated with the cellulose solutions, theformer are allowed to stand to'permit the solvent in such solutions toevaporate.

After the material thus treated has become dried, it is soaked in meltedtallow, Japan wax, grease" or otherdubricant, at about 160 degrees Fahn,and subsequently cooled by airor a cold water bath.

\ The lubricant adheres to the outer surface of the individual fibersall through the packing but does not penetrate the fibers owing to thewaterproofing.

The product is a very superior form of hydraulic packing which retainsits elasticity. and lubricating values in the presence of either warm orcold water. The expulsion of the moisture followed by the waterproofingoperation or the waterproofing alone prevents the absorption of moisturewhen the packing is in use, or when in storage.

We find, that the strength and elasticity of the fibrous material aregreatly increased by the expulsion of the moisture, and that thisimprovement is further augmented by the waterproofing. This increasei'ofstren h is several times that exhibited by fiber whlch .has beenlubricated Without previously expelling themoisture or applying theabove treatment.

The addition of the rubber to cellulose acetate lacquer adds furtherflexibility and durability, We may or. may not use the rubber.

What we desire to claim is:

,1. The process of manufacturing hydrau-' lic packing consisting infirst expelling the moisture from the fibrous aterial, then treating thesame with a cel ulose solution to render it waterproof, and then coatingthe fibers with lubricant.

- 3. The process of manufacturing hydraulic packing consisting in firstexpelling the moisture from fibrous material, then waterproofing thesame by means of a cellulose solution with a rubber content, and thenintroducing lubricant into the same.

4. A new and improved hydraulic packing composed of fibers treated withcellulose solution and carrying a lubricant.

5. A new and improved hydraulic packing composed of fibers from whichthe moisture has been expelled, treated with cellulose solution andcarrying. a lubricant.

Signed at Pittsburgh, Penna., this 19th day of October, 1917.

CHARLES E. VANCE. I JOHN A. VETTER.

